Glossary Condition
Swan-neck deformity
Polski: Deformacja typu łabędzia szyja Czytaj po polsku →
Swan-neck deformity is the inverse pattern of the boutonnière — hyperextension at the PIP joint with flexion at the DIP. In the mallet-related context, untreated terminal tendon disruption produces unopposed flexion at the DIP and, over time, compensatory PIP hyperextension as extensor force is redirected proximally and the volar plate at the PIP attenuates. Swan-neck deformity also arises in rheumatoid arthritis, in volar plate insufficiency from trauma, and in spasticity-related imbalance. The deformity is a late complication of untreated mallet injury and motivates timely splinting even when the acute presentation appears trivial.
Articles mentioning this term
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Proximal interphalangeal (PIP) joint arthritis: fusion or joint replacement
PIP joint arthritis (the middle joint of a finger): fusion or replacement, silicone or surface implants, complications, failed implants and recovery.
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Clinical examination of the hand and wrist
Hand and wrist examination for FESSH candidates: how accurate the Phalen, Tinel, scratch collapse, Elson, Watson, grind, fovea and Allen tests really are.
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Extensor tendon injuries: zone-based diagnosis and management
Diagnosis, classification, splinting and surgical management of extensor tendon injuries, with contemporary rehabilitation evidence.